what is gprs ?

##   General Packet Radio Service

##   General packet radio service (GPRS) is a packet oriented mobile data service available to all users of the 2G cellular communication systems global system for mobile communications (GSM), as well as in the 3G systems. In 2G systems, GPRS provides data rates of 56-114 kbit/second

##    GPRS is the Mobile Data service that gives you the power to enjoy continuous wireless connection to Internet even when you are on the move.You can now get instant access to your favorite web sites, social media platforms, entertainment services and other web applications. Also, gaming is no longer restricted to the basic snake games. You can seamlessly download and enjoy all types of games.

What is data ?

The contents of an element in an XML stream, generally
used when the element does not contain any
subelements. When it does, the term content is
generally used. When the only text in an XML structure
is contained in simple elements and when elements that
have subelements have little or no data mixed in, then
that structure is often thought of as XML data, as
opposed to an XML document.

What is CTS ?

Compatibility test suite. A suite of compatibility
tests for verifying that a J2EE product complies with
the J2EE platform specification.

What is CSS ?

Cascading style sheet. A stylesheet used with HTML and
XML documents to add a style to all elements marked
with a particular tag, for the direction of browsers
or other presentation mechanisms.

What is credentials ?

The information describing the security attributes of
a principal.

What is create method ?

A method defined in the home interface and invoked by
a client to create an enterprise bean.

What is CORBA ?

Common Object Request Broker Architecture. A
language-independent distributed object model
specified by the OMG.

What is conversational state ?

The field values of a session bean plus the transitive
closure of the objects reachable from the bean's
fields. The transitive closure of a bean is defined in
terms of the serialization protocol for the Java
programming language, that is, the fields that would
be stored by serializing the bean instance.

What is context root ?

A name that gets mapped to the document root of a Web
application.

What is context attribute ?

An object bound into the context associated with a
servlet.

What is content ?

In an XML document, the part that occurs after the
prolog, including the root element and everything it
contains.

What is container-managed sign-on ?

The mechanism whereby security information needed for
signing on to a resource is supplied by the container.

What is container-managed persistence ?

The mechanism whereby data transfer between an entity
bean's variables and a resource manager is managed by
the entity bean's container.

What is container ?

An entity that provides life-cycle management,
security, deployment, and runtime services to J2EE
components. Each type of container (EJB, Web, JSP,
servlet, applet, and application client) also provides
component-specific services.

What is Connector architecture ?

An architecture for integration of J2EE products with
enterprise information systems. There are two parts to
this architecture: a resource adapter provided by an
enterprise information system vendor and the J2EE
product that allows this resource adapter to plug in.
This architecture defines a set of contracts that a
resource adapter must support to plug in to a J2EE
product-for example, transactions, security, and
resource management.

What is connector ?

A standard extension mechanism for containers that
provides connectivity to enterprise information
systems. A connector is specific to an enterprise
information system and consists of a resource adapter
and application development tools for enterprise
information system connectivity. The resource adapter
is plugged in to a container through its support for
system-level contracts defined in the Connector
architecture.

What is component contract ?

The contract between a J2EE component and its
container. The contract includes life-cycle management
of the component, a context interface that the
instance uses to obtain various information and
services from its container, and a list of services
that every container must provide for its components.

What is commit ?

The point in a transaction when all updates to any
resources involved in the transaction are made
permanent.

What is comment ?

In an XML document, text that is ignored unless the
parser is specifically told to recognize it.

What is client-certificate authentication ?

An authentication mechanism that uses HTTP over SSL,
in which the server and, optionally, the client
authenticate each other with a public key certificate
that conforms to a standard that is defined by X.509
Public Key Infrastructure.

What is certificate authority ?

A trusted organization that issues public key
certificates and provides identification to the
bearer.

What is CDATA ?

A predefined XML tag for character data that means
"don't interpret these characters," as opposed to
parsed character data (PCDATA), in which the normal
rules of XML syntax apply. CDATA sections are
typically used to show examples of XML syntax.

What is cascade delete .?

A deletion that triggers another deletion. A cascade
delete can be specified for an entity bean that has
container-managed persistence.

What is caller ?

The principal that identifies the invoker of the
enterprise bean method.i.i.also known as caller princeple

What is callback methods

Component methods called by the container to notify
the component of important events in its life cycle.

What is business method ?

A method of an enterprise bean that implements the
business logic or rules of an application.

What is business logic ?

The code that implements the functionality of an
application. In the Enterprise JavaBeans architecture,
this logic is implemented by the methods of an
enterprise bean.

What is build file ?

The XML file that contains one or more asant targets.
A target is a set of tasks you want to be executed.
When starting asant, you can select which targets you
want to have executed. When no target is given, the
project's default target is executed.

What is binding (JavaServer Faces technology) ?

Wiring UI components to back-end data sources such as
backing bean properties.

What is binding (XML) ?

Generating the code needed to process a well-defined
portion of XML data.

XML data binding refers to the process of representing the information in
an XML document as an object in computer memory.

This allows applications to access the data in the XML from the object
rather than using the DOM or SAX to retrieve the data from a direct
representation of the XML itself.

What is bean-managed transaction ?

A transaction whose boundaries are defined by an
enterprise bean.

What is bean-managed persistence ?

The mechanism whereby data transfer between an entity
bean's variables and a resource manager is managed by
the entity bean.

What is basic authentication ?

An authentication mechanism in which a Web server
authenticates an entity via a user name and password
obtained using the Web application's built-in
authentication mechanism.

What is backing bean ?

A JavaBeans component that corresponds to a JSP page
that includes JavaServer Faces components.

The backing bean defines properties for the components on the page
and methods that perform processing for the component.

This processing includes event handling, validation,
and processing associated with navigation.

What is B2B

Business-to-business (B2B) describes commerce transactions between
businesses, such  as  between  a  manufacturer  and  a  wholesaler ,  or
between a wholesaler and a retailer.

Contrasting terms are

business-to-consumer (B2C)
business-to-government (B2G).

The volume of B2B transactions is much higher than the volume of B2C transactions.
The primary reason for this is that in a typical supply chain there will be many B2B
transactions involving subcomponent or raw materials, and only one B2C transaction,
specifically sale of the finished product to the end customer. For example, an automobile
manufacturer makes several B2B transactions such as buying tires, glass for windscreens,
and rubber hoses for its vehicles. The final transaction, a finished vehicle sold to the
consumer, is a single (B2C) transaction.

What is authorization constraint

An authorization rule that determines who is permitted
         to access a Web resource collection.

What is authorization?

The process by which access to a method or resource is
determined.
 Authorization depends on the determination
of whether the principal associated with a request
through authentication is in a given security role.

A security role is a logical grouping of users defined
by the person who assembles the application.

A deployer maps security roles to security identities.
Security identities may be principals or groups in the
operational environment.

What is "applet container"

A container that includes support for the applet
programming model.

What is "applet"

A J2EE component that typically executes in a Web
browser but can execute in a variety of other
applications or devices that support the applet
programming model.

What is the difference between Session bean and Entity bean?one?

The Session bean and Entity bean are two main parts of
EJB container.

Session Bean

#  represents a workflow on behalf of a cliennt
# one-to-one logical mapping to a client.
# created and destroyed by a client
# not permanent objects
# lives its EJB container(generally) does noot survive
system shut down

entity bean

# two types: stateless and stateful beans Entity Bean
# represents persistent data and behavior off this
data
# can be shared among multiple clients
# persists across multiple invocations
# findable permanent objects
# outlives its EJB container, survives systeem
shutdown
# two types: container managed persistence(CCMP) and
bean managed persistence(BMP)

What are the differences between Ear, Jar and War files? Under what circumstances should we use each one?

 #   There are no structural differences between the files;
they are all archived using zip-jar compression.
However, they are intended for different purposes.

#   Jar files (files with a .jar extension) arre
intended to hold generic libraries of Java classes,
resources, auxiliary files, etc.

#  War files (files with a .war extension) arre
intended to contain complete Web applications. In this
context, a Web application is defined as a single
group of files, classes, resources, .jar files that
can be packaged and accessed as one servlet context.

#   Ear files (files with a .ear extension) arre
intended to contain complete enterprise applications.
In this context, an enterprise application is defined
as a collection of .jar files, resources, classes, and
multiple Web applications.

#  Each type of file (.jar, .war, .ear) is processed
uniquely by application servers, servlet containers,
EJB containers, etc.

What does web module contain?

The web module contains:
--JSP files,
--class files for servlets,
--GIF and HTML files, and
--a Web deployment descriptor.
Web modules are packaged as JAR files with a .war (Web
ARchive) extension.

What does application client module contain?

The application client module contains:
--class files,
--an application client deployment descriptoor.
Application client modules are packaged as JAR files
with a .jar extension.

What are the four types of J2EE modules?

1. Application client module
2. Web module
3. Enterprise JavaBeans module
4. Resource adapter module

What are the components of J2EE application?

A J2EE component is a self-contained functional
software unit that is assembled into a J2EE
application with its related classes and files and
communicates with other components. The J2EE
specification defines the following J2EE components:

Application clients and applets are client components.


Java Servlet and JavaServer PagesTM (JSPTM) technology
components are web components.

Enterprise JavaBeansTM (EJBTM) components (enterprise
beans) are business components.

Resource adapter components provided by EIS and tool
vendors.

What is the J2EE module?

A J2EE module consists of one or more J2EE components
for the same container type and one component
deployment descriptor of that type.